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Extracellular and membrane-bound proteases from Bacillus subtilis.

P Mäntsälä, H Zalkin

    Journal of Bacteriology
    |February 1, 1980
    PubMed
    Summary

    Bacillus subtilis YY88 produces more extracellular and membrane-bound proteases, primarily alkaline serine and neutral metalloproteases. Novel M proteases were identified on the membrane, distinct from secreted enzymes.

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    Area of Science:

    • Microbiology
    • Enzymology
    • Biochemistry

    Background:

    • Bacillus subtilis is a key industrial microorganism.
    • Understanding protease secretion and localization is crucial for optimizing biotechnological applications.

    Purpose of the Study:

    • To characterize the proteases synthesized by Bacillus subtilis YY88.
    • To investigate the presence and nature of membrane-bound proteases.

    Main Methods:

    • Enzyme purification and characterization (molecular weight, amino-terminal sequencing, inhibitor sensitivity).
    • Immunoprecipitation and ion-exchange chromatography.
    • Analysis of protease activity in extracellular and membrane fractions.

    Main Results:

    • Two major extracellular proteases (alkaline serine and neutral metalloprotease) were purified and characterized.
    • Membrane vesicles contained bound forms of these proteases and novel M proteases.
    • M proteases (M1-M4) were distinct from extracellular proteases, with M2 and M3 exhibiting exopeptidase activity.

    Conclusions:

    • Bacillus subtilis YY88 exhibits complex protease production, with both secreted and membrane-bound forms.
    • Novel M proteases on the membrane suggest specialized roles in cell wall metabolism or protein anchoring.
    • Characterization provides insights into Bacillus subtilis protease systems for potential industrial use.

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